[工学]陈立德机械设计基础第4和5章课后习题答案

[工学]陈立德机械设计基础第4和5章课后习题答案4 4.14.24.3 1ϕ90o + ϕ24.4 1p( p = rf 0 )24.5η≤04.6 1 k 2 4.7 1θ ≠0k >12 4.8 124.9 c4.9 d 21ω14.9 4.9 a1vb .vb = ω1 ⋅ ababω1vcvc = vb+ vcbω1l ab⊥ ab⊥ bcµvvcb ，m/smmuuv pcvcuu v bcvc = µ v ⋅ pcvcb = ω 2 ⋅ lbcvcb = µv ⋅ bcω2ω2 =vcb lbcvduuu v pdb c ddvdvd = µv ⋅ pd..